Class 331/162 - Plural crystals in circuit

Subclass of Class 331 - Oscillators
Definition: Subject matter wherein two or more separate crystals are
No. of patents: 33
Last issue date: 05/29/2012

Number	Title	Issue Date
8188800	Crystal oscillator with reduced acceleration sensitivity A crystal oscillator having a plurality of quartz crystals that are manufactured so that the directional orientation of the acceleration sensitivity vector is essentially the same for each crystal. This enables convenient mounting of the crystals to a circuit assemb...	05/29/2012
7378916	Crystal oscillator device, oscillation method and heater The crystal oscillator device for simultaneously generating oscillator signals with a plurality of oscillation modes of a crystal unit, comprising: a primary resonator unit filtering the oscillator signal with a primary oscillation mode, which is one of the oscillat...	05/27/2008
7248127	Crystal oscillator A quartz crystal oscillator in which phase noise is reduced includes: a resonance circuit having a quartz crystal unit and a split capacitor connected to the crystal unit; a transistor for oscillation having its base connected to the node of the crystal unit and the...	07/24/2007
7180382	Wide band voltage controlled crystal oscillator A voltage controlled Colpitts type crystal oscillator includes a first crystal and a transistor coupled to the first crystal to provide positive feedback for generating an output oscillatory signal. A variable capacitance is coupled to the first crystal for producin...	02/20/2007
7170357	Crystal oscillator with wide tuning range A crystal oscillator having a crystal filter with multiple crystals in a ladder configuration, resonant at a desired operating frequency. An oscillatory signal loop feedback path includes a voltage controlled phase shifter operable to shift the phase of the signal i...	01/30/2007
6756863	High-frequency oscillator of frequency switching type and high-frequency oscillation method An oscillator of frequency switching type according to the present invention is adapted to select and output any of a plurality of high frequencies. The oscillator of frequency switching type includes a plurality of crystal oscillators whose fundamental frequencies ...	06/29/2004
6545550	Residual frequency effects compensation A means is provided to estimate the amount of frequency deviation experienced in a precision resonator resulting from the effects of previous thermal history, acceleration, or aging by determining the differential effect of the perturbing condition on dif...	04/08/2003
5608356	Thermometer for remote temperature measurements An instrument is provided for measuring the temperature of an object from infrared radiation emitted by the object. The instrument includes a radiation detector, a temperature indicating device connected to the detector, and a modulator disposed in a path...	03/04/1997
5512864	Method and apparatus for compensating for neutron induced frequency shifts in quartz resonators A neutron radiation insensitive crystal oscillator. The device includes two crystals with neutron sensitivity coefficients of opposite sign. The crystals may be connected either in parallel or series relationships. The addition of tuning reactances to the...	04/30/1996
5428315	Method of making radiation hardened quartz crystal oscillators A method is provided of making radiation compensated quartz crystal oscillators. According to the method, at least two quartz crystal oscillators are first selected that have different responses to energetic radiation from gamma rays, neutrons, etc. Each ...	06/27/1995
5406230	Chip type oscillator and oscillation circuit using this oscillator A chip type oscillator which comprises two oscillator elements bonded to each other, and two protective plates bonded to the outer surfaces of the oscillator elements. The oscillator elements have lead electrodes which are provided on corner portions ther...	04/11/1995
5319324	Method of direct bonding of crystals and crystal devices A method of directly bonding a crystal to a crystal includes the steps of mirror-polishing the surfaces of the crystals and then rinsing them with a cleaning material and then affecting a baking operation and then bonding them together and thereafter anne...	06/07/1994
5229735	Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals A wide frequency deviation voltage controlled crystal oscillator includes a multiple section bandpass filter containing a plurality of crystal or ceramic elements. One embodiment includes a plurality of crystals which are connected into parallel conductio...	07/20/1993
5200714	Crystal oscillator with quartz vibrator having temperature detecting faculty, quartz vibrator for use therein, and method of measuring temperature using quartz vibrator A crystal oscillator for generating an output oscillation whose frequency is maintained constant independently of the variation of temperature including a first quartz vibrator arranged in a heating unit which includes a thermostat and vibrating at a fund...	04/06/1993
4916405	Smart sweep apparatus for data rate receivers Apparatus is provided for locking onto a severe doppler shifted data modulated carrier signal. A phase lock loop of the type having a data detection branch, a carrier tracking branch and a voltage controlled oscillator branch is modified to provide a summ...	04/10/1990
4851790	Crystal controlled oscillator exhibiting reduced levels of crystal-induced low frequency noise, vibration sensitivity and circuit temperature rise A crystal-controlled oscillator exhibiting reduced levels of crystal-induced low frequency noise, vibration sensitivity and circuit temperature rise includes an amplifier or oscillator sustaining stage which is secured to a heat sink. A plurality of cryst...	07/25/1989
4760351	Multiple oscillator device having plural quartz resonators in a common quartz substrate A system is described which comprises many quartz resonators, all formed on the same quartz substrate. The method of fabrication ensures that all the resonators are mechanically and electrically isolated from each other. The oscillation frequencies of the...	07/26/1988
4757278	Low noise cryogenic dielectric resonator oscillator A microwave oscillator is provided which can operate at a temperature of many degrees above absolute zero while providing very low phase noise that has heretofore generally required temperatures within a few degrees K. The oscillator includes a ring-shape...	07/12/1988
4745376	Fault tolerant oscillator circuit having redundant resonant elements An oscillator having a multiplicity of resonant structures parallel coupled to form a fault tolerant resonator in the feedback circuit of the oscillator. This fault tolerant resonator permits the oscillator to operate in a near fault free manner after the...	05/17/1988
4734657	RF modem with oscillator switching circuit A channel switching oscillator circuit (230) in which the oscillator frequency is selected from one of a predetermined number of frequencies by switching into the oscillator circuit (230) one of a plurality of tank circuits (L4, L5, L6). The tank circuit ...	03/29/1988
4616194	Piezoelectric oscillator with crystal filter and temperature compensation A piezoelectric oscillator operating in the aperiodic or overtone mode comprising a first piezoelectric resonator having a resonance frequency at which the oscillator is to operate. One side of the first resonator is connected to ground, and the other sid...	10/07/1986
4600900	Piezoelectric oscillator having filters to prevent unwanted modes A piezoelectric oscillator of the Clapp type for operation in the overtone mode comprises a piezoelectric resonator having a C-mode resonance frequency at which the oscillator is designed to operate, the resonator being connected between the base of a tra...	07/15/1986
4596697	Chemical sensor matrix A chemical sensor matrix is provided for sensing the presence of chemical agents by chemo-electronic means. The chemical sensor matrix is comprised of a plurality of resonators embedded in a single monolithic piece of piezoelectric crystal. The resonators...	06/24/1986
4575690	Acceleration insensitive oscillator A crystal oscillator, including two crystals of unequal acceleration sensvity magnitude and mounted such that their respective acceleration sensitivity vectors are aligned in an anti-parallel relationship, further includes at least one electrical reactan...	03/11/1986
4570132	Low noise multiple crystal-controlled oscillator An oscillator circuit utilizing multiple (two) quartz crystal resonators as the frequency controlling elements in a novel circuit arrangement. The use of two crystal units increases the oscillator circuit signal transmission group delay by a factor of 2 t...	02/11/1986
4358839	Absolute digital clock system An absolute digital clock system which is capable of counting absolute time despite the disruptive effects of a nuclear event, or other disturbance, on the electronic circuitry of the system. The clock system of the invention includes a master quartz crys...	11/09/1982
4325036	Temperature compensating circuit Temperature compensating circuit for an electronic timepiece having two piezo electric resonators having different frequency-temperature characteristics. Two piezo electric resonators are a major resonator having smaller frequency variation rate in temper...	04/13/1982
4242611	Methods and apparatus for providing ultra-stable frequency standards and clocks Improved clocks and frequency standards are provided through the use of single crystals having a mass of the order of kilograms maintained at temperatures of the orders of few degrees Kelvin which are caused to vibrate freely at low modes of resonant vibr...	12/30/1980
4227182	Minute change detecting system A minute change detecting system comprises sensor means which changes its electrical constant according to a physical change of an object under measurement to affect the oscillation frequency of at least one of two high-frequency oscillators, and mixer me...	10/07/1980
4219754	Temperature compensation by positioning of plural piezoelectric vibrators in an electronic wristwatch In an electronic wristwatch having a watch body an a plurality of electronic vibrators having frequency-position characteristics, the frequency-temperature characteristic of the standard signal generated thereby is improved by positioning the vibrators in...	08/26/1980
4107625	Transistor crystal oscillator which may be paired for generating a beat frequency An oscillator circuit comprising a transistor, a piezoelectric element and a D.C. source, such as a battery, said transistor being common collector mounted and said piezoelectric element being disposed between the base of said transistor and a first termi...	08/15/1978
4063194	Wide-band frequency-controlled crystal oscillator An oscillator formed of an amplifier with a feedback loop containing two parallel connected crystals in series with a voltage variable capacitance. The two crystals have respective resonance frequencies above and below the limits of a wide band over which...	12/13/1977
3978432	Oscillator having plural piezoelectric vibrators parallel connected for temperature compensation A piezoelectric oscillator has two or more piezoelectric vibrator units connected in parallel. At least one said unit has a frequency-temperature characteristic of third degree and the others have characteristic of second degree so as to afford compensati...	08/31/1976

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Class 331/162 - Plural crystals in circuit